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Additional Information Regarding Company's Outstanding Stock Options (Detail) (USD $)
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding at beginning of year 2,099,672 2,454,952
Options granted 114,815 178,009
Options exercised (192,738) (517,817)
Options forfeited (16,968) (15,472)
Options outstanding at end of year 2,004,781 2,099,672
Options exercisable at end of year 1,650,289 1,599,095
Options vested and expected to vest at end of year 1,987,333 2,070,866
Option price range at end of year (Lower) $ 0.05 $ 0.05
Option price range at end of year (Upper) $ 4.12 $ 3.78
Aggregate intrinsic value of options exercised during year $ 396,976 $ 693,490
Options outstanding at beginning of year (Weighted Average Exercise Price) $ 2.13 $ 2.00
Options granted (Weighted Average Exercise Price) $ 3.86 $ 3.24
Options exercised (Weighted Average Exercise Price) $ 1.82 $ 1.90
Options forfeited (Weighted Average Exercise Price) $ 3.05 $ 2.70
Options outstanding at end of year (Weighted Average Exercise Price) $ 2.25 $ 2.13
Options exercisable at end of year (Weighted Average Exercise Price) $ 2.16 $ 2.00
Options vested and expected to vest at end of year (Weighted Average Exercise Price) $ 2.25 $ 2.02